JPH1180871A - Aluminum alloy clad material for heat exchanger, excellent in corrosion resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To particularly improve alkaline corrosion resistance by providing a sacrificial anode material, to be used for cladding, with a composition consisting of an element which combines with Al to form a compound nobler in electric potential than its matrix and the balance Al, etc., and also allowing a compound of specific grain size to exist in specific quantities in the matrix. SOLUTION: The compound existing in the matrix of the sacrificial anode material is a compound of one or >=2 elements among Fe, Ni, Si, Mn, and Co and Al. Further, the grains of this compound, having 1 to 10 μm grain size, are finely dispersed in the matrix by (5×10<2> to 5×10<4> )pieces per square millimeter. By providing such a matrix characteristic, the deposition of aluminum hydroxide as film component can be inhibited in the part where the compound is present at the surface of the sacrificial anode material and the formation of film can be prevented. As a result, film defects are increased and pitting corrosion is dispersed, by which the occurrence of through pitting corrosion can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum alloy clad material for a heat exchanger having excellent corrosion resistance, and more particularly, to a radiator and a heater core for an automobile by inert gas atmosphere brazing or vacuum brazing using a fluoride flux. When manufacturing an aluminum heat exchanger, such as a tube material (clad plate welded tube), piping material connected to the heat exchanger (extruded clad tube)
In particular, the present invention relates to an aluminum alloy clad material for a heat exchanger having excellent corrosion resistance to an alkali corrosive environment caused by a coolant usually used in the heat exchanger.

[0002]

2. Description of the Related Art Tube materials such as radiators and heater cores for automobiles and header plate materials are 3003.
Al-Mn based alloy such as alloy
A three-layer aluminum alloy clad material is used in which an Al-Zn-based alloy or an Al-Zn-Mg-based alloy is clad on the other surface as a sacrificial anode material, clad with a -Si-based brazing material.

[0003] In the aluminum alloy clad material, the Al-Si brazing material is used for joining a tube material and a fin material by an inert gas atmosphere brazing or vacuum brazing using a fluoride flux, a tube material and a header. The sacrificial anode material is provided for joining with the plate material.When assembled on an aluminum heat exchanger such as a radiator or heater core, the sacrificial anode material comes into contact with the working fluid and exhibits a sacrificial anode effect on the working fluid. It is provided to prevent pitting and crevice corrosion of the core material.

As a piping material for connecting the heat exchangers for automobiles, an Al—Mn alloy such as 3003 alloy is used as a core material, and 7072 is provided on the inner surface or inner and outer surfaces thereof.
A two-layer or three-layer clad tube clad with a sacrificial anode material of an Al—Zn-based alloy such as an alloy is used. The inner surface clad with the sacrificial anode material is in contact with the working fluid, exerts a sacrificial anode effect on the working fluid, preventing pitting and crevice corrosion of the core material, and the outer surface occurs when used in a harsh environment Prevents core pitting and crevice corrosion.

In these heat exchangers, as a working fluid, generally, an antifreeze containing ethylene glycol as a main component, which is commercially available as a coolant, is mixed with water in an amount of 0 to 50 vol.
Neutral to weakly alkaline solutions diluted to 1% concentration are used. Usually, most of the coolant is weakly alkaline, and depending on the type, the pH is around 10. It is often experienced that pitting corrosion penetrates the core material in the aluminum alloy clad material constituting the above, and impairs the heat exchange function.

[0006] By examining the combination of the component composition of the core material and the component composition of the sacrificial anode material, pitting resistance is enhanced, and as a corrosion-resistant aluminum alloy clad material having an excellent sacrificial anode effect, for example, a core material is used. , Mn: 0.3 to 2.0
%, Mg: 0.10 to 0.80%, Cu: 0.05 to
An aluminum alloy containing 0.50%, the balance being Al and unavoidable impurities, and a clad material clad on one side of the core material, containing Zn: 0.3 to 2.0%, Mg:
An aluminum alloy containing 0.1 to 2.5%, the balance being Al and unavoidable impurities, and a cladding material clad on the other side of the core material, Si: 7.0 to 1
5.0%, Mg: 0.3-2.5%, the balance being Al
In addition, a clad material made of an aluminum alloy including unavoidable impurities has been proposed. (Japanese Patent Publication 62-45
No. 301)

[0007] Also, Al alloy core material has
In a three-layer aluminum alloy clad material having a sacrificial anode material clad on the other surface, Zn: 0.5 to 3%, Ti: 0.05 to 3%, M
g: 0.1 to 5%, Si: 0.3 to 1.5%, and if necessary, a small amount of one of Sn, In, Ca, and Li.
Using an Al alloy containing one or more species and the balance consisting of Al and unavoidable impurities (JP-A-5-23)
No. 9580), the core material is Mn: 0.3 to 2.0%,
Cu: 0.25 to 0.8%, Si: 0.2 to 1.0%,
Mg: 0.5% or less, Ti: 0.35% or less,
The sacrificial anode material is composed of an aluminum alloy including the balance of Al and unavoidable impurities, and the Zn: 0.5 to 2.0
%, Mg: 1.2 to 2.5%, Si: 0.2 to 0.8%
And an aluminum alloy comprising the balance of Al and unavoidable impurities (Japanese Patent Laid-Open No. 4-198444).
No. 7) has also been proposed.

These aluminum alloy clad materials are:
When used as a tube material for aluminum heat exchangers such as radiators and heater cores, the working fluid
In the case of a solution containing Cl ions at a relatively low temperature and a neutral to weak acidity, it exhibits an excellent sacrificial anode effect, but when the working fluid is an alkaline solution having a pH of 9 or more, corrosion resistance is still insufficient. In many cases, pitting occurs and the anticorrosion effect cannot be exerted.

In order to solve this problem, the present inventors
As a sacrificial anode material of a three-layer clad material, Fe: 0.5 to
3.0%, Ni: One or two kinds of 0.1 to 3.0%, and if necessary, Mg, Zn, In, Sn,
It has been proposed to apply an aluminum alloy to which one or more types of Ga are added. (Japanese Unexamined Patent Publication No. 9-176768)
This clad material has excellent alkali corrosion resistance in a normal use environment. However, if the use environment becomes more severe, a sufficient corrosion resistance effect may not always be obtained.

In a process of studying the cause of pitting corrosion generated in an aluminum alloy clad material clad with a sacrificial anode material in an alkaline solution having a pH of 9 or more and a countermeasure thereof, in an alkaline environment, the sacrificial anode It was found earlier that a thick porous film with a brown to black color was formed on the surface of the layer, and corrosion was concentrated on the defective portions of the film, resulting in preferential corrosion, resulting in through-holes. As a result, the compound particles in the matrix present on the surface of the material may inhibit the formation of a film by preventing the deposition of aluminum hydroxide as a film component,
Forming many film defects at locations where film formation is impeded,
It has been found that by dispersing the pitting, the occurrence of through pitting can be prevented.

[0011]

DISCLOSURE OF THE INVENTION The present invention has been made based on the above findings, and its object is to provide corrosion resistance,
Particularly excellent in alkali corrosion, Cl in the case or neutral to weakly acidic using a working fluid having an alkaline ^- above aluminum alloy capable of preventing the generation of a through-hole by pitting even when using a solution containing An object of the present invention is to provide a clad material.

[0012]

According to the present invention, there is provided an aluminum alloy clad material for a heat exchanger having excellent corrosion resistance for attaining the above object, in which an aluminum alloy brazing material is clad on one surface of a core material made of an aluminum alloy. In an aluminum alloy clad material having a sacrificial anode material clad on the other surface, the sacrificial anode material contains an element that combines with Al to generate a compound having a higher potential than the matrix of the sacrificial anode material, and the remaining Al and impurities The first feature is that the matrix contains 5 × 10 ^{2 to} 5 × 10 ⁴ compounds having a particle diameter of 1 to 10 μm per 1 mm ² in the matrix.

The compound present in the matrix of the sacrificial anode material is a compound of one or more of Fe, Ni, Si, Mn and Co with Al and the sacrificial anode material. , Si: 0.5-1.0%, M
n: 0.5 to 2.0%, Fe: 0.5 to 1.5%, N
A second and third feature is that one or more of i: 0.3 to 1.5% and Co: 0.3 to 1.5% are contained and the balance is Al and impurities. And the sacrificial anode material further contains Zn: 0.5 to 5.0%, In: 0.01 to
0.3%, Sn: 0.01-0.1%, Mg: 2.5%
One or more of the following (not including 0%, the same applies hereinafter)
Containing the species and the sacrificial anode material further comprises Be:
0.1% or less, B: 0.1% or less, Ca: 1.0% or less, V: 0.1% or less, Cr: 0.3% or less, Bi:
Fourth and fifth features include one or more of 0.1% or less, Ti: 0.3% or less, and Zr: 0.3% or less.

[0014] Further, in an aluminum alloy clad material in which an aluminum alloy brazing material is clad on one surface of a core material made of an aluminum alloy and a sacrificial anode material is clad on the other surface, the sacrificial anode material is Si: 0.5 to 1 0.0%, M
g: an aluminum alloy containing 2.5% or less, the balance being Al and impurities, and Mg ₂ Si particles having a particle diameter of 1 to 10 μm in a matrix of the aluminum alloy are 5 × 10 ^{2 to} 5 × 5 per 1 mm ^2. × 10 ⁴ , aluminum alloy having the above composition, and Zn:
0.5-5.0%, In: 0.01-0.3%, Sn:
0.01 to 0.1%, Be: 0.1% or less, B: 0.1
% Or less, Ca: 1.0% or less, V: 0.1% or less, C
r: 0.3% or less, Bi: 0.1% or less, Ti: 0.3
% Or less, one or more of Zr: 0.3% or less, and the core material is an Al-Mn or A
Sixth, seventh, and eighth features of the present invention are that the first, seventh, and eighth aspects of the present invention include an l-Mn-Cu-based aluminum alloy.

In the present invention, the sacrificial anode material contains an element which combines with Al to form a compound having a higher potential than the matrix of the sacrificial anode material, and is composed of an aluminum alloy consisting of the balance of Al and impurities. 5 × per 1 mm ² of the compound particle size 1~10μm in
It is important to finely disperse 10 ^{2 to} 5 × 10 ⁴ pieces. By adopting such a matrix property, the deposition of aluminum hydroxide as a film component is hindered and the formation of a film is suppressed in the portion where the compound on the surface of the sacrificial anode material exists, so that film defects increase and pores increase. Since the pits are dispersed, the pits do not localize and progress in the depth direction as in the case where the number of film defects is small, so that the occurrence of through pits can be prevented. When the number of the compounds per 1 mm ² increases, the self-corrosion resistance deteriorates.

The significance of the alloy components in the sacrificial anode material according to the present invention and the reasons for limiting them will be described.
i, Si, Mn, and Co each represent A in the matrix.
l-Fe compound, Al-Ni compound, Al-Fe-
Ni-based compound, Al-Si-Mn-based compound, Al-Si
-Finely disperse Fe-based compounds, Al-Mn-based compounds, Al-Co-based compounds, etc., and prevent deposition of aluminum hydroxide as a film component at the position of the compound present on the material surface, thereby suppressing film formation. As a result, the portion becomes a film defect and pitting occurs. However, since the film defect is present around the finely dispersed compound and the number thereof is large and uniformly distributed, the pitting is also dispersed. As a result, the corrosion depth becomes shallow, and no through holes are formed.

With respect to the preferable content of each component for producing and dispersing the above compound in the matrix of the sacrificial anode material, the preferable content range of Fe is 0.5 to 1.5%.
If less than 0.5%, the effect is small, and 1.5%
When the content exceeds the range, the self-corrosion of the sacrificial anode material increases, and the rolling processability decreases. The more preferable content range of Fe is 0.7 to 1.2%. The preferred range of Ni content is 0.3 to 1.5%. If the content is less than 0.3%, the effect is not sufficient. If the content exceeds 1.5%, the self-corrosion of the sacrificial anode material increases, and Rollability deteriorates. The more preferable content of Ni is 0.7 to 1.2%.
Range.

The preferred content range of Si is 0.5 to 1.0.
%, The effect is small when it is less than 0.5%.
%, The self-corrosion of the sacrificial anode material increases and the rolling processability decreases. The more preferable content range of Si is 0.7 to 1.0%. The preferred range of Mn is 0.5-2.0%, and if it is less than 0.5%, the effect is not sufficient. If it exceeds 2.0%, the self-corrosion of the sacrificial anode material increases, and Rollability deteriorates. The more preferable content of Mn is 0.7 to 1.2.
% Range. The preferred content range of Co is 0.3 to
When the content is less than 0.3%, the self-corrosion of the sacrificial anode material increases and the rolling processability deteriorates. A more preferred content of Co is in the range of 0.5 to 1.0%.

Mg forms Mg ₂ Si in coexistence with Si, and the compound is finely dispersed in the matrix. At the position of the compound present on the material surface, the deposition of aluminum hydroxide, which is a coating component, is prevented. Suppress formation of film. As a result, the portion becomes a film defect and pitting occurs, but the film defect is present around the finely dispersed compound and, therefore, the number thereof is large and uniformly distributed.
Pitting corrosion is also dispersed, so that the corrosion depth becomes shallow and no through holes are formed.
The preferred range of Mg content is 2.5% or less,
%, The self-corrosion resistance of the sacrificial anode material is reduced.
Is more preferably 1.5% or less.

Zn, In, and Sn make the potential of the sacrificial anode material base, maintain the sacrificial anode effect on the core material, and prevent pitting and crevice corrosion of the core material. The preferred content of Zn is in the range of 0.5 to 5.0%. If the content is less than 0.5%, the effect is not sufficient, and the self-corrosion exceeding 5.0% is reduced. A more preferable content range of Zn is 1.0 to 2.5.
%. The preferred content of In is 0.01 to 0.3%.
If the content is less than 0.01%, the effect is not sufficient, and the self-corrosion exceeding 0.3% is reduced and the rolling workability is deteriorated. The more preferable content range of In is 0.01 to 0.05%. Further, the preferred content of Sn is in the range of 0.01 to 0.1%. If the content is less than 0.01%, the effect is not sufficient, and the self-corrosion exceeding 0.1% is reduced and the rolling processability is reduced. Deteriorates. The more preferable Sn content range is 0.01 to 0.05%.

B, Ca, V, Cr, Ti, and Zr form compounds with Al in the same manner as the above-mentioned Fe, Ni, etc.
This is finely dispersed in the matrix of the sacrificial anode material, preventing the deposition of aluminum hydroxide, which is a film component, at places where compounds on the material surface are present, suppressing the formation of a film and dispersing pitting corrosion and penetrating. It functions to prevent pitting. The preferred content is B: 0.1% or less, C
a: 1.0% or less, V: 0.1% or less, Cr: 0.3%
Hereinafter, Ti: 0.3% or less and Zr: 0.3% or less. If the respective upper limits are exceeded, the self-corrosion resistance and rolling workability of the sacrificial anode material decrease. In addition, Bi: 0.1%
Below, even if Be: 0.1% or less is contained, the performance of the present invention is not affected and the characteristics can be improved. However, if it exceeds the upper limit, the self-corrosion resistance and rolling workability are impaired.

In the present invention, an aluminum alloy having the above composition is used as a sacrificial anode material, and 0.1% is used as a core material.
3 to 2.0% Mn or 0.3 to 2.0% Mn;
An aluminum alloy containing 0.1-1.0% Cu,
Alternatively, when an aluminum alloy to which one or two of 0.5% or less of Mg and 1.0% or less of Si are added is used in combination, a particularly excellent effect can be obtained.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The aluminum alloy clad material for a heat exchanger of the present invention is formed by semi-continuous casting of an aluminum alloy constituting a core material, a sacrificial anode material and a brazing material.
After homogenizing the core material and sacrificial anode material,
Hot rolling is performed to a predetermined thickness as necessary. The brazing material is also hot-rolled if necessary, then the respective materials are combined, and the clad material is formed by hot rolling according to a conventional method, and finally subjected to cold rolling to a predetermined thickness.

In the process of manufacturing the clad material, the compound is dispersed in the matrix of the sacrificial anode material. The finely dispersed state of the predetermined compound according to the present invention depends on the composition of the aluminum alloy constituting the sacrificial anode material and the sacrificial anode material. The ingot homogenization treatment condition, the hot rolling condition of the clad material, the degree of cold rolling, and the condition of the intermediate annealing performed during the cold rolling are adjusted. For example, the cooling rate of the ingot is set to 0.
1 ° C / s to 100 ° C / s, homogenization is not performed, or homogenization is performed in a temperature range of 400 to 500 ° C, and intermediate annealing after clad rolling is performed at 200 to 400 ° C. An inventive compound dispersion can be obtained.
The particle size of the compound in the sacrificial anode material should be measured by taking a 200-fold optical microscope photograph in five visual fields (total area: 0.15 mm ² ) and measuring the compound particle size (circle equivalent diameter) distribution by an image analyzer. Required by

When a welded tube is manufactured from the aluminum alloy clad material of the present invention to be used as a tube material for a heat exchanger, and as a header plate material, it is used for assembling an aluminum heat exchanger such as a radiator or a heater core for an automobile. Performs brazing in an inert gas atmosphere using a fluoride-based flux or vacuum brazing in a brazing furnace by combining a fin material of an aluminum alloy.

To this end, in the aluminum alloy clad material of the present invention, an Al—Si brazing material or an Al—Si—Mg brazing material is clad on one surface of the core material.
In this case, an Al-Si alloy containing 6 to 13% of Si is basically used for brazing in an inert gas atmosphere, and further, for example, Mg:
An Al-Si-Mg alloy containing 0.5 to 3.0% is applied. These Al-Si based brazing materials, Al-Si-Mg
The brazing filler metal contains one or more of Bi: 0.1% or less, Be: 0.1% or less, Ca: 1.0% or less, and Li: 1.0% or less. Can also.

[0027]

【Example】

Example 1 An aluminum alloy for core material (JIS 3
003 alloy-Mn: 1.2%, Cu: 0.15%, balance Al and impurities), an aluminum alloy for a sacrificial anode material having a composition shown in Tables 1 and 2, and an alloy for a brazing material (JI
SBA4343-Si: 7.5%, balance Al and inevitable impurities). The ingots of the aluminum alloy for the core material and the aluminum alloy for the sacrificial anode material are subjected to a homogenization treatment, and the ingots of the aluminum alloy for the sacrificial anode material and the alloy for the brazing material are hot-rolled to a predetermined thickness. The material and the ingot of the core material alloy were combined and hot-rolled to obtain a clad material. Furthermore, cold rolling and intermediate annealing were performed, and a clad plate material (H14) having a thickness of 0.25 mm was produced by final cold rolling. The thickness configuration of the clad sheet material
The thickness of the brazing material was 0.025 mm (cladding rate 10%), and the thickness of the sacrificial anode material was 0.025 to 0.060 mm (cladding rate 10 to 24%).

[0028]

[Table 1]

[0029]

[Table 2]

After the obtained clad plate material was heated to a brazing temperature of 600 ° C. (material temperature) in a nitrogen gas atmosphere using a fluoride-based flux without disposing a fin material, A corrosion test was performed.

Corrosion test 1: On the sacrificial anode material side, a commercially available antifreeze was diluted with distilled water to a concentration of 30 vol%,
Using a corrosive solution adjusted to pH 10 by adding caustic soda, the test material was placed in a corrosive solution heated to a temperature of 88 ° C. for 8 hours.
After immersion, the cycle of cooling and maintaining the temperature at 25 ° C. for 16 hours was repeated for 4 months.

Corrosion test 2: On the sacrificial anode material side, Cl
_{^{-: 195ppm, SO 4 2 -}} : 60ppm, Cu 2+ 1p
pm, an aqueous solution containing 30 ppm of Fe ³⁺ :
A cycle in which the test material was immersed in a corrosion solution heated to a temperature of 88 ° C. for 8 hours, cooled, and maintained at a temperature of 25 ° C. for 16 hours, was repeated for 3 months.

The results of the corrosion test are shown in Tables 3 and 4. As can be seen from Table 3, all of the test materials according to the present invention have good rolling workability and do not cause defects such as cracks.
The maximum corrosion depth according to the corrosion tests 1 and 2 was less than 0.1 mm, and showed excellent corrosion resistance not reaching 1/3 of the plate thickness.

[0034]

[Table 3]

[0035]

[Table 4]

Comparative Example 1 An aluminum alloy for a sacrificial anode material having the composition shown in Tables 5 to 6, the same aluminum alloy for a core material and an alloy for a brazing material as in Example 1 were ingoted by continuous casting. According to the conditions described above, a clad plate material having a thickness of 0.25 mm (brazing material thickness:
(0.025 mm, sacrificial anode material thickness: 0.025 mm). For the obtained clad plate material, a test material for a corrosion test was produced under the same conditions as in Example 1, and the same corrosion test as in Example 1 was performed. The results are shown in Tables 7 and 8.

[0037]

[Table 5]

[0038]

[Table 6]

[0039]

[Table 7]

[0040]

[Table 8]

As shown in Table 7, the test material No. 41
In Nos. To 57, the number of compounds having a particle size of 1 to 10 μm per 1 mm ² was out of the range of the present invention, so that the corrosion resistance was poor, and the pitting corrosion occurred in any of the corrosion test 1 and the corrosion test 2. Test material No. In Nos. 58 to 63, the content of In, Sn, Bi, and Be in the sacrificial anode material was large, so that the self-corrosion resistance of the sacrificial anode material was inferior.

[0042]

According to the present invention, there is provided an aluminum alloy clad material for a heat exchanger having excellent corrosion resistance, particularly excellent alkali corrosion resistance. This aluminum alloy clad material can be suitably used particularly as a tube material for a radiator for automobiles, a heater core, and the like, and a header plate material.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI C23F 13/00 C23F 13/00 PF28F 19/06 F28F 19/06 A

Claims (8)

[Claims] An aluminum alloy clad material comprising an aluminum alloy core material clad on one surface with an aluminum alloy brazing material and a sacrificial anode material on the other surface, wherein the sacrificial anode material is combined with Al to form a sacrificial anode material. Containing elements that form compounds nobleer than the material matrix, with the balance being A
1 and an aluminum alloy consisting of impurities, and the particle diameter in the matrix (equivalent circle diameter, the same applies hereinafter)
The compounds of 1~10μm is 1 mm ² per 5 × 10 ²
An aluminum alloy clad material for heat exchangers having excellent corrosion resistance, characterized in that there are up to 5 × 10 ⁴ . 2. The method according to claim 1, wherein the compound present in the matrix of the sacrificial anode material is a compound of one or more of Fe, Ni, Si, Mn, and Co with Al. Item 4. An aluminum alloy clad material for a heat exchanger having excellent corrosion resistance according to Item 1. 3. The sacrificial anode material is composed of Si: 0.5 to 1.0%.
(% By weight, hereinafter the same), Mn: 0.5 to 2.0%, F
e: 0.5 to 1.5%, Ni: 0.3 to 1.5%, C
3. An aluminum alloy clad material for a heat exchanger having excellent corrosion resistance according to claim 2, wherein one or more of o: 0.3 to 1.5% is contained, and the balance is Al and impurities. . 4. The sacrificial anode material further comprises Zn: 0.5 to
5.0%, In: 0.01 to 0.3%, Sn: 0.01
The heat exchange excellent in corrosion resistance according to claim 3, characterized in that the heat exchange contains one or two of 0.1 to 0.1% and Mg: 2.5% or less (excluding 0%, the same applies hereinafter). Aluminum clad material for equipment. 5. The sacrificial anode material further contains Be: 0.1% or less, B: 0.1% or less, Ca: 1.0% or less, and V: 0.1% or less.
1% or less, Cr: 0.3% or less, Bi: 0.1% or less,
4. The composition according to claim 3, wherein one or more of Ti: 0.3% or less and Zr: 0.3% or less are contained.
4. An aluminum alloy clad material having excellent corrosion resistance according to 4. 6. An aluminum alloy clad material in which a core material made of an aluminum alloy is clad with an aluminum alloy brazing material on one surface and a sacrificial anode material on the other surface, wherein the sacrificial anode material is Si: 0.5 to 1 0.0%, Mg:
Containing 2.5%, is made of aluminum alloy and the balance Al and impurities, particle size 1~10μm of Mg ₂ Si particles per ^{1mm 2 5 × 10 2 ~5 ×} 10 in the matrix of the aluminum alloy Aluminum alloy clad material for heat exchangers with excellent corrosion resistance, characterized by the presence of ^four . 7. The sacrificial anode material may further comprise Zn: 0.5 to
5.0%, In: 0.01 to 0.3%, Sn: 0.01
0.1%, Be: 0.1% or less, B: 0.1% or less,
Ca: 1.0% or less, V: 0.1% or less, Cr: 0.3
%, Bi: 0.1% or less, Ti: 0.3% or less, Z
The aluminum alloy clad material having excellent corrosion resistance according to claim 6, wherein one or more of r: 0.3% or less are contained. 8. The core material is made of Al—Mn or Al—Mn—
The aluminum alloy clad material having excellent corrosion resistance according to claim 1, comprising a Cu-based aluminum alloy.